Malicious PDF — malware analysis report

Static analysis result for SHA-256 4afd1efc4e7ca735…

MALICIOUS

PDF

106.5 KB Created: 2021-03-17 17:10:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 28a007b5ac3e0a1b3ff7511d98b5098c SHA-1: 3e441914c604a706f341a196700d9ae5c724ac61 SHA-256: 4afd1efc4e7ca735459dc477186a9d985df83081ae7976fb55e1e2a6a9b072d9
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF document is identified as malicious by multiple heuristics, including ML classification and ClamAV detection, and is flagged as a brand-impersonation credential phishing lure. It directs users to install a browser extension or update, a common social-engineering tactic for malware installation. The document contains numerous external URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/segijabitufi.pdf.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/strik?utm_term=program+management+tools+jira PDF link annotation
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/segijabitufi.pdfIn PDF document text
    • https://wuwemupijebuvat.weebly.com/uploads/1/3/4/0/134012408/67952930306.pdfIn PDF document text
    • http://malespw.xyz/mapa_turistico_aguilar_de_campooapi5r.pdfIn PDF document text
    • http://creamwalls.online/counter_strike_1._6_servers_free0tg2o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377908/normal_60111ba24055e.pdfIn PDF document text
    • http://idealica-italiauficiale.website/cambridge_checkpoint_science_9lv2er.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410207/normal_5fd161e0f0975.pdfIn PDF document text
    • http://opit.space/ranokmxa7g.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/kimigafujer_laleximasatoga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495265/normal_600f625cbd959.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386609/normal_5fec9689d2bbd.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/14986456686lwf1z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d62a3b8b-2640-4a31-bf8b-f8188034a6e7/where_can_i_find_ezgo_model_number.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/vexuwalad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fca780f-fe91-44d9-a9ff-d1979cce636a/95263335581.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/6209476005.pdfIn PDF document text
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_4b34ada007b84b06bce46b9bef70ce78.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c9ac6ee-4e96-493f-8245-5eaba33483d7/blender_2.8_tutorial_ita.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/15958269817.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eca6acb-9aca-4d0b-9c57-c43aebc9ed27/accuair_elevel_parts.pdfIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_83e3803eddb94ba59383e819bbc33caa.pdf?index=trueIn PDF document text
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_5105ca0bf2ee4d0fbaf91fecaacdcd11.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/305f5b1a-15f1-47d7-a01c-92b921d30a09/bodewakekosajogem.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000162e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162E8 5080 bytes
SHA-256: 3b8b7e05093b72d391711cd1168be9064359ee2a84b2beb08de9f13dcf783ad3
font_01_sfnt_off00017419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17419 11556 bytes
SHA-256: e3328c412286248193c52e31031af168478b5d78a3ec3306ac7ca3f250017d59